- ChemGlobe: Niobium - Electronic, thermal, and steric data along with a table of isotopes.
www.vcs.ethz.ch/chemglobe/ptoe/_/41.html
- ChemicalElements.com: Niobium - Basic information, atomic structure, and isotopes.
www.chemicalelements.com/elements/nb.html
- It's Elemental: Niobium - Basic physical and historical information.
education.jlab.org/itselemental/ele041.html
- LANL: Niobium - History, sources, properties, and uses.
pearl1.lanl.gov/periodic/elements/41.html
- Niobium - Data tables and historic information.
www.scescape.net/~woods/elements/niobium.html
- USGS Minerals Information: Niobium - Statistics and information on the worldwide supply, demand, and flow of the element (PDF format).
minerals.usgs.gov/minerals/pubs/commodity/niobium
- Visual Elements: Niobium - Image, uses, general information, and ionisation energies.
www.chemsoc.org/viselements/pages/niobium.html
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